I recently realized that my understanding of currency symbols from different countries is a bit confusing, especially how to type the euro symbol and similar issues, which I never quite figured out.

Later, I organized a note and found that these symbols are actually quite interesting behind the scenes.

For example, the main purpose of currency symbols is to simplify writing. Writing $100 is definitely much faster than writing 100 US dollars, which is why these shorthand symbols are used worldwide.
￥ represents both the Chinese Yuan and the Japanese Yen, so it can be confusing, and is usually marked as CNY￥ or JPY￥ to distinguish.
The $ symbol is even more exaggerated, used in over 30 countries globally; the US dollar, Canadian dollar, Australian dollar, and New Taiwan dollar all use $, and to differentiate, prefixes like US$, C$, or A$ are added.

Regarding how to type the euro symbol, I looked up the shortcut keys.
On Mac, it's Shift+Option+2, on Windows it's Alt+E, other common ones include Pound Sterling, which is Option+3 (Mac) or Alt+L (Windows), and the dollar sign is Shift+4.
These symbols are used especially frequently in forex trading and international payments.

Interestingly, a single currency symbol and a currency pair are two different things.
EUR/USD is not a symbol but the exchange rate between the euro and the US dollar, with the first called the base currency and the second called the quote currency.
Investors trade these currency pairs to seek profits.
So next time you see the euro symbol or other currency symbols, you'll know what they each represent.